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	Dynamic Resource Allocation for Energy Efficient Transmission in Digital Subscriber Lines
	Zhang, Nan ; Yao, Zhi-Qiang ; Liu, Yixian ; Boyd, Stephen P. ; Luo, Zhi-Quan
	2017
关键词	DSL resource allocation discontinuous operation energy efficiency dynamic programming DSL SYSTEMS
英文摘要	Linear matrix precoding, also known as vectoring, is a well-known technique to mitigate multiuser interference in the downlink digital subscriber line (DSL) transmission. While effective in canceling interference, vectoring does incur major communication overhead and computational overhead in terms of the transmission of idle symbols and precoder-data multiplications at each data frame, resulting in significant energy consumption when the number of lines is large. To facilitate energy efficient transmission, it has been recently proposed (in the G. fast standard) that each data frame is divided into a normal operating interval (NOI) and a discontinuous operating interval (DOI). In the NOI, all lines (or users) are involved in a common vectoring group, which requires a large matrix precoder, whereas in the DOI, the lines are subdivided into multiple small nonoverlapping vectoring subgroups and are transmitted in a time division multiple access manner, requiring small matrix multiplications and, thus, improving the energy efficiency. In this paper, we consider the key dynamic resource allocation problems in downlink DSL: given the real-time demands, determine the optimal transmission scheme: The optimal NOI and DOI size in each data frame as well as the optimal grouping strategy in the DOI, and optimally adjust the transmission scheme. We formulate these optimal dynamic resource allocation problems and propose efficient real-time algorithms to solve them to global optimality. Simulation results are shown to demonstrate the efficiency and the effectiveness of the proposed algorithms.; NSFC [61372127, 61571384]; Key Discipline of Hunan Province and Key Laboratory of Intelligent Computing & Information Processing, Xiangtan University, Ministry of Education, China; Leading Talents of Guangdong Province program [00201510]; SCI(E); ARTICLE; 16; 4353-4366; 65
语种	英语
出处	SCI
出版者	IEEE TRANSACTIONS ON SIGNAL PROCESSING
内容类型	其他
源URL	[http://hdl.handle.net/20.500.11897/471488]
专题	数学科学学院
推荐引用方式 GB/T 7714	Zhang, Nan,Yao, Zhi-Qiang,Liu, Yixian,et al. Dynamic Resource Allocation for Energy Efficient Transmission in Digital Subscriber Lines. 2017-01-01.

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